Wordnet 3.0
NOUN (1)
1.
a native or resident of Missouri;
The Collaborative International Dictionary of English v.0.48:
Missourian \Missourian\ prop. n.
A resident of Missouri.
[WordNet 1.5]
WordNet (r) 3.0 (2006):
Missourian
n 1: a native or resident of Missouri